Company lists · Data refreshed September 2026
Top 25 Clinical trial law firms based in Houston, United States
RevenueBase identified 95 clinical trial law firms headquartered in Houston, United States as of September 2026 and tracks 1,883 professional contacts across them, including 954 with verified work emails. Across the United States, Houston is the largest hub for this category.
This list covers clinical trial law firms headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest clinical trial law firms based in Houston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 387 contacts → | ||||
Indirect evidence “Susman Godfrey is America’s premier litigation boutique.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 182 contacts → | ||||
Partial evidence “Founded in 1990 by Mark Lanier, The Lanier Law Firm is committed to addressing client concerns with effective and often untraditional solutions.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 118 contacts → | ||||
Partial evidence “Talented, Tough and Courtroom-Tested Ahmad, Zavitsanos & Mensing, or AZA, is first and foremost a trial firm.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 87 contacts → | ||||
Partial evidence “Williams Hart & Boundas, LLP is a Houston-based personal injury law firm founded in 1985.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 87 contacts → | ||||
Indirect evidence “Since 1951, Abraham Watkins has served individuals and families across Houston and Texas in serious personal injury matters.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 45 contacts → | ||||
Indirect evidence “Proxima CRO works with the new class of rising stars in drugs, devices, diagnostics and digital therapeutics.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 39 contacts → | ||||
Partial evidence “Hicks Johnson PLLC is a premier trial and appellate boutique with offices in Houston and Chicago, known for delivering successful outcomes in high-stakes, complex litigation…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 37 contacts → | ||||
Indirect evidence “Founded in 1990, DecisionQuest, a U.S.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 35 contacts → | ||||
Indirect evidence “Bailey Cowan Heckaman PLLC represents plaintiffs because we are passionate about advocating for the underdog.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 31 contacts → | ||||
Indirect evidence “The personal injury attorneys at Pierce Skrabanek have helped Texans secure justice in personal injury, maritime injury and industrial accident cases for over 30 years.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 30 contacts → | ||||
Indirect evidence “For more than 20 years, Robins Cloud has been fighting for people against corporate wrongdoing.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 30 contacts → | ||||
Indirect evidence “For over two decades Kwok Daniel has been trying cases against some of the biggest corporations on earth, including British Petroleum, GlaxoSmithKline, Union Pacific Railroad…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 30 contacts → | ||||
Partial evidence “The Ferrell Law Group is a national law firm specializing in asbestos lung cancer and mesothelioma cases as well as serious personal injury matters.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 28 contacts → | ||||
Strong evidence “Trial Law Firm Handling Cases Throughout the United States Clark, Love & Hutson is a nationally recognized law firm that represents victims of corporate negligence and malfeasance…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 26 contacts → | ||||
Partial evidence “CEBIS, a full-service CRO headquartered in Houston, Texas, will provide a comprehensive integrated solution for clinical research (including start-up to CSR, phase I to IV)…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 26 contacts → | ||||
Indirect evidence “Lee Murphy represents individuals throughout the United States affected by manufacturing defects, hidden medication side effects, defective products, catastrophic personal injury…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 24 contacts → | ||||
Partial evidence “The Nations Law Firm is a national catastrophic injury and pharmaceutical litigation firm.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 22 contacts → | ||||
Partial evidence “The Ammons Law Firm, LLP is a nationwide personal injury law firm built on a foundation of hard work and unwavering client commitment.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 21 contacts → | ||||
Partial evidence “Pusch & Ngyuen is a personal injury law firm specializing in all injury related matters.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 21 contacts → | ||||
Indirect evidence “If you or a family has sustained an injury caused by the negligence of another, it is crucial for you to understand the options that you have.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 20 contacts → | ||||
Partial evidence “First and foremost, we really are trial lawyers, and we have a clear record going back decades to prove it.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 20 contacts → | ||||
Indirect evidence “JUNELL & ASSOCIATES, PLLC is a company based out of 3737 Buffalo Speedway, Ste.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 18 contacts → | ||||
Indirect evidence “At Reich & Binstock LLP, our highly esteemed pharmaceutical litigation and personal injury attorneys have more than 30 years of legal experience and 20 years of experience leading…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 17 contacts → | ||||
Partial evidence “FLCB ~ Nationwide Trial Lawyers with Experience, Commitment and Ethics For more than thirty years FLCB trial lawyers have focused on the client's priorities-your priorities.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 17 contacts → | ||||
Partial evidence “At Tracey Fox & Walters, our award-winning law firm has a reputation for successfully handling cases involving serious accidents and complex litigation.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: clinical trial law firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names clinical trial law firms.
- Partial evidence
- Its own public description names part of clinical trial law firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name clinical trial law firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 95 clinical trial law firms based in Houston, United States
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Clinical trial law firms based in Houston, United States at a glance
As of Sep 27, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 95 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among clinical trial law firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Houston, United States whose own description of what they do matches “clinical trial law firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names clinical trial law firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among clinical trial law firms, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 954 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 27, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Clinical trial law firms by metro in the United States
- Clinical trial law firms in Chicago77
- Clinical trial law firms in New York75
- Clinical trial law firms in Atlanta68
- Clinical trial law firms in Miami58
- Clinical trial law firms in Dallas48
- Clinical trial law firms in Philadelphia48
- Clinical trial law firms in Los Angeles45
- Clinical trial law firms in San Diego41
- Clinical trial law firms in Washington39
- Clinical trial law firms in Boston38
- Clinical trial law firms in Tampa34
- Clinical trial law firms in San Francisco31
- Clinical trial law firms in Austin27
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names clinical trial law firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many clinical trial law firms are there based in Houston, United States?
RevenueBase identified 95 clinical trial law firms headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Susman Godfrey LLP, headquartered in Houston, tops this list with the largest team on record.
Which city in the United States has the most clinical trial law firms?
Houston leads the United States with 95 headquartered companies, followed by Chicago (77) and New York (75).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 954 verified decision-maker contacts tracked across these 95 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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